<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link href="css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<ul class="nav nav-pills nav-justified">
    <li class="active"><a href="#">商品介绍</a> </li>
    <li class="dropdown"><a href="#" class="dropdown-toggle" data-toggle="dropdown">规格参数<span class="caret"></span> </a>
        <ul class="dropdown-menu">
            <li><a href="#" class="text-center">二级菜单</a> </li>
            <li ><a href="#" class="text-center">二级菜单</a> </li>
            <li><a href="#" class="text-center">二级菜单</a> </li>
            <li><a href="#" class="text-center">二级菜单</a> </li>
        </ul>
    </li>
    <li><a href="#">商品评价</a> </li>
    <li><a href="#">商品评价</a> </li>
    <li><a href="#">商品评价</a> </li>
    <li><a href="#">商品评价</a> </li>
    <li><a href="#">商品评价</a> </li>
    <li><a href="#">商品评价</a> </li>
    <li class="disabled"><a href="#">售后保障</a> </li>
</ul>
<script src="http://img.mukewang.com/down/53c6484f00013d9300000000.js"></script>
<script src="js/bootstrap.min.js"></script>
</body>
</html>